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Income Taxes (Details) - USD ($) $ in Millions | May. 31, 2015 | May. 31, 2014
--- | --- | ---
Deferred tax assets: |  |
Compensation and employee benefit liabilities | $ 20.9 | $ 18.7
Other current liabilities | 6.9 | 6.9
Tax credit carry forward | 40.1 | 38.3
Depreciation | 11.9 | 8.3
Stock-based compensation | 21.6 | 21.1
Other | 24.9 | 28.7
Gross deferred tax assets | 126.3 | 122.0
Deferred tax liabilities: |  |
Capitalized software | 53.6 | 50.1
Depreciation | 3.8 | 12.2
Goodwill and Intangible assets | 52.0 | 46.7
Revenue not subject to current taxes | 13.1 | 12.6
Unrealized gains on available-for-sale securities | 5.3 | 13.2
Other | 0.3 | 0.4
Gross deferred tax liabilities | 128.1 | 135.2
Net deferred tax liability | $ (1.8) | $ (13.2)

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